Builder's hardware; a manual for architects, builders and house furnishers . Fig. 27. Round Neck-bolts. Stanley Fig. 28. Square Neck-Bolt. Staniey Works. 32 BUILDERS HARDWARE. ?Chapter IV. Figure 29 shows a form which is designated as a mosquito- bar bolt, and is used for a number of light purposes. It ismade without any jamb-staple. Excepting Figure 28, the foregoing bolts are made without anysprings. Much the same patterns are found in the market under Spring-bolts. ^e designation of spring-bolts, the bolt being held either open

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