The jacks are similar, but they will benefit from being arranged back to back, since the two [bass] octaves take as much space as four in an ordinary harpsichord Prior to 1980 when Keith Hill introduced his design for a pedal harpsichord, most pedal harpsichords were built based on the designs of extant pedal pianos from the 19th century, in which the instrument is as wide as the pedalboard.
Heavy-duty steel shelving of 18-gauge or lower is generally recommended for records. storage. The smaller the gauge number, the stronger the shelving; thus 16-gauge or 12-. gauge steel shelving is also appropriate. Shelving higher than 18-gauge is weaker and. may not be appropriate for records storage.
At an age of 1 day the 120Â°F concrete was strongest and the 25Â°F concrete was weakest. By 7 days the high-temperature cured concretes had no more strength than the 73Â° concrete or even less. By the age of 28 days the high-temperature concretes were weaker than the 73Â° concrete. From 28 days to 1 year the 55Â° concrete was considerably stronger than the 73Â° concrete. From 90 days onward the 40Â° concrete was stronger than the 73Â° concrete and the 25Â° concrete was slightly stronger than the 73Â° concrete. All of this suggests that, provided there is continuous curing, concrete cured at about 55Â° for the first 28 days ultimately reaches the highest strength.