MACHINE FOR SHARPENING SAWS.--E. B. Rich, South Boston, Mass.--This
invention relates to a machine for the sharpening of saw blades, whether
straight or circular, and consists in the combination of a revolving or
rotating grinding wheel made of any suitable material, and a holder for
the saw blade, so arranged together that as the grinding wheel revolves
the saw will be presented to the same, or the wheel to the saw-blade,
in such a manner as to produce the desired sharpening of the teeth, in
regular order and succession.
DOOR SPRING.--Rudolph Schrader, Indianapolis, Ind.--The present
invention relates to a spring for doors, that being properly connected
with the door will operate to close, whether when opened it swings
inside or outside through the casing to the door, the spring being
especially applicable to doors hung to swing through their casing, or
inside and outside.
PORTABLE DERRICK.--D. J. McDonald, Gold Hill, Nevada.--This invention
relates to a new and improved derrick, and it consists in a novel
construction and arrangement of parts, whereby the device may be readily
drawn from place to place, the crane or derrick frame adjusted in any
desired position within the scope of its movement, friction avoided, and
the whole apparatus manipulated with the greatest facility.
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