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Two illustrative candle holding modules, each of which have a plurality of openings for receiving candles therein for display and a plurality of projections which individually fit into a selected opening in other similar modules. The combination allows the building of an innumerable variety of three

Two illustrative candle holding modules, each of which have a plurality of openings for receiving candles therein for display and a plurality of projections which individually fit into a selected opening in other similar modules. The combination allows the building of an innumerable variety of three dimensional arrays of candles. One module includes a linear array of candle receiving cells with an equal number of projections beneath them, each cell and its associated projection being structurally related to allow combining a plurality of such modules together in a variety of arrangements. A second module includes a square array of identically sized and shaped cells and projections to interfit with other first or second type modules.

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Two illustrative candle holding modules, each of which have a plurality of openings for receiving candles therein for display and a plurality of projections which individually fit into a selected opening in other similar modules. The combination allows the building of an innumerable variety of three

Two illustrative candle holding modules, each of which have a plurality of openings for receiving candles therein for display and a plurality of projections which individually fit into a selected opening in other similar modules. The combination allows the building of an innumerable variety of three dimensional arrays of candles. One module includes a linear array of candle receiving cells with an equal number of projections beneath them, each cell and its associated projection being structurally related to allow combining a plurality of such modules together in a variety of arrangements. A second module includes a square array of identically sized and shaped cells and projections to interfit with other first or second type modules. e surface can cease drilling operations upon detection of the cessation of rotation of the roller element. The rotation impeder can also be seated in a drilling fluid outlet and cause a detectable loss in drilling fluid pressure when dislodged to otherwise cease rotation of the roller drill bit. ethod for erecting, transporting, and disassembling a drilling rig on the ground, said method comprising: rolling said drill rig components into proximity with said drilling site on ground engaging wheels, said drill rig components including a mobile telescoping substructure box and a drill mast raising said substructure box relative to said ground engaging wheels, disengaging said wheels from said substructure box lowering said substructure box toward the ground, connecting said drill mast to said mobile telescoping substructure box, raising said drill mast to an upright position, and telescoping said mobile telescoping substructure box into an extended position. 10. The method of claim 9, further including a step of: hoisting said drill rig components into place using hoisting means coupled to said mast. 11. The method of claim 10, further including the steps of: monitoring said mobile telescoping substructure box rise to an extended position using cables; sensing a tension value on said cables; generating a stop signal indicative of a predetermined tension being reached in said cables and said substructure box being in a desired extended position. 12. The method of claim 11, further including the steps of: stopping said mobile telescoping substructure box unit from being extended in response to said stop signal, and locking said mobile telescoping substructure box unit in an extended position in response to said stop signal. 13. A method for erecting, transporting, and disassembling a drilling rig, said method comprising: transporting drill rig components to a drilling site using trailer means coupled to said drill rig components, positioning said drill rig components into proximity with said drilling site, said drill rig components including a mobile telescoping substructure box and a drill mast; connecting said drill mast to said mobile telescoping substructure box; raising said drill mast to an upright position; telescoping said mobile telescoping substructure box unit toward an extended position; monitoring a limit value of said mobile telescoping substructure box rise to an extended limit position, sensing the substructure box rise to said limit value, and generating a stop signal indicative of reaching said limit value and said substructure box being in a desired extended position. 14. A substructure box for supporting a drill mast of a mobile land rig comprising: mobile means; a first support structure mountable on said mobile means, displaceable between a first position supported on said mobile means and a second position resting on the ground; means for selectively displacing said first support structure between said first and second positions thereof; a second support structure mounted on said first support structure, displaceable between retracted and extended positions and having means for detachably, pivotally connecting a mast thereon angularly displaceable between a lower, transportable position and an erect, operative position, supported on said second support structure, when connected thereto; and means for selectively displacing said second support structure between said retracted and extended positions. 15. A substructure box according to claim 14 wherein said displacing means comprise fluid actuated cylinder assemblies. 16. A substructure box according to claim 14 including means for guiding said support structure along a line of travel when displaced relative to each other. 17. A substructure box according to claim 14 including means for releaseably locking said second support structure relative to said first structure when said second support structure is in said extended position. 18. A substructure box according to claim 14 when said support structures are telescopically connected. 19. A mobile land rig comprising: a first mobile means including a first support structure mountable on said mobile means, displaceable between a first position supported on said